Bioventing principles have been applied to completely dechlorinate tetrachloroethylene vapors in the unsaturated zone in a sequential anaerobic-aerobic pattern. The aerobic step yields trans-DCE and VC as PCE reductive dechlorination byproducts, while TCE and cis-DCE are observed as intermediates. The aerobic step results in rapid oxidation of the VC and trans-DCE to carbon dioxide. Hydrogen was delivered in the gas phase as a reducing agent for the anaerobic step at levels of 1%, and oxygen at 4.2% was used as an electron acceptor in the aerobic step. PCE and VC half lives in the anaerobic and aerobic steps respectively, where less than 10 min.
Complete remediation of PCE contaminated unsaturated soils by sequential anaerobic-aerobic bioventing
P. G. Mihopoulos, M. T. Suidan, G. D. Sayles; Complete remediation of PCE contaminated unsaturated soils by sequential anaerobic-aerobic bioventing. Water Sci Technol 1 March 2001; 43 (5): 365–372. doi: https://doi.org/10.2166/wst.2001.0325
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